An auto body repair person, or auto body technition
Body man, auto body technician,
an auto mechanic
I am not sure what the actual person would be called but I would assume a body shop is who you would need to call to have this done. Some body shops are better than others and some deal with mostly collision work. I would start calling around and asking you may want to find a body shop that deal is restoration. It may be more costly but a reputable shop that does restorations may be you best bet. Good Luck!! - - - - - The person who applies decals and vinyl to cars is called an installer. They work either in sign shops or vehicle wrap shops - both decals and vinyl are considered signage. The person who applies custom paint jobs is either a painter (if he works in a shop large enough to have separate paint and body-repair departments) or a body repair technician.
Motorist.
basls
To do a good job you do need some training, however no special training would be required to repair classic cars.
A car mechanic.
RICH
A car collector?
mechanic is what it is called that you very much
He/she is called a car dealer.